MOTOR CORTEX AND INTERNAL CAPSULE IN AN ORANO-OUTANG. 135 
indicated in the title of this section, and more closely resembled the character of the 
corresponding movement obtained from the angle in front of the junction of the limbs 
of the prsecentral sulcus in the Bonnet Monkey. The head and eyes moved in the 
horizontal plane. 
(3) Bilateral Closure of the Eyelids, hut those of theop^posite side more strongly than 
those of the same side. —This movement, which we have found definitely marked in 
the Bonnet Monkey,'" situated just between the lower end of the intra-parietal sulcus 
and the Fissure of Rolando, was here in the Orang observed to be just in front of 
the latter fissure at a homologous level, i.e., at squares 120, 121, 122, 123, 124, 125, 
12G. (See fig. 3, Plate 18.) The lids of both eyes closed, but those of the same side 
far less completely than those of the opposite side. 
Movements of the Face. 
We shall next consider the movements of the lower part of the face, including the 
lips, mouth, and tongue, but before doing so, we must call special attention to the 
great development and mobility of the lips in the Orang, especially in the young 
animal (see p. 136). 
The movements of the mouth and lips are very varied, and we have arranged them 
according to the following list. 
Elevation of upper lip, opposite side 
Retraction of angle of mouth, opposite 
Eversion of lip, opposite side 
Rolling in of both lips 
Pursing of lips 
Pouting of lips 
Closing of mouth 
(4) Elevation of upper lip of opposite side. —This movement was obtained at 
squares 95, 96, 97, 121, 127; it was most marked at square 97 ; thus at 96 the latent 
period was long,t and at 127 the movement was very slightly marked. The repre¬ 
sentation of this movement is thus found as a narrow band in the ascending parietal 
gyrus close behind the Fissure of Rolando, and above the horizontal level of the lower 
end of the intraparietal sulcus (see fig. 4, Plate 18). 
(5) Retraction {horizontal) of the op>posite angle of the mouth. —Retraction [i.e., 
with no elevation) of the angle of the mouth was elicited at squares 100, 101, 102, 
103, 7, 8, 98, 99, 9, 10, 11, 12, 13, 14, 96. 
The position of representation of this movement thus covers the middle third of 
that portion of the ascending frontal gyrus, which extends between the Fissure of 
Sylvius and the well-marked genu which we have in previous communications shown 
t Cf. next ai’ticle on “ Retraction," sqna,re 96, 
side 
Unilateral. 
[> Bilateral. 
* Not yet pnbli.shed. 
